I got into my Uni of choice with 60 OU credits and am now in my second year. However, it's worth e-mailing your particular Uni to see if they would accept that. My Uni also told me they preferred OU to Access students, although my ex-Access student friends seem to have a really good grounding in the subject and good knowledge of technology relating to the course!

Best of luck - doing a degree as a mature student with a family isn't easy but I've enjoyed most of it!